I was wondering the exact same thing! But you know, I think it's because A) they're comfortable and B) they're cheap. Obviously the people who wear them don't care about style and aesthetics. It's like those hooded people in your country who wear adidas from head to toe even though they've never worked out in their lives.

How can u tell it‘s fake?

All most everyone in Shanghai use iphone4. I assume most r fake, but I don't know.

I just bought an iPhone 6, I'm sure it's legit.

As for Crocs, I think it's because they are easy to wash. Human baby poop comes right off them.

where did you find a fake iPhone 6,, i don't even hve a fake iPhone 5 or 4 yet.

I even came across some wearing it with socks...